//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package org.apache.ibatis.ognl;

import java.util.HashMap;
import java.util.Map;

/**
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
class ASTMap extends SimpleNode {
  private static Class DEFAULT_MAP_CLASS;
  private String className;

  static {
    /* Try to get LinkedHashMap; if older JDK than 1.4 use HashMap */
    try {
      DEFAULT_MAP_CLASS = Class.forName("java.util.LinkedHashMap");
    } catch (ClassNotFoundException ex) {
      DEFAULT_MAP_CLASS = HashMap.class;
    }
  }

  public ASTMap(int id) {
    super(id);
  }

  public ASTMap(OgnlParser p, int id) {
    super(p, id);
  }

  protected void setClassName(String value) {
    className = value;
  }

  protected Object getValueBody(OgnlContext context, Object source) throws OgnlException {
    Map answer;

    if (className == null) {
      try {
        answer = (Map) DEFAULT_MAP_CLASS.newInstance();
      } catch (Exception ex) {
        /* This should never happen */
        throw new OgnlException("Default Map class '" + DEFAULT_MAP_CLASS.getName() + "' instantiation error", ex);
      }
    } else {
      try {
        answer = (Map) OgnlRuntime.classForName(context, className).newInstance();
      } catch (Exception ex) {
        throw new OgnlException("Map implementor '" + className + "' not found", ex);
      }
    }

    for (int i = 0; i < jjtGetNumChildren(); ++i) {
      ASTKeyValue kv = (ASTKeyValue) children[i];
      Node k = kv.getKey(),
          v = kv.getValue();

      answer.put(k.getValue(context, source), (v == null) ? null : v.getValue(context, source));
    }
    return answer;
  }

  public String toString() {
    String result = "#";

    if (className != null) {
      result = result + "@" + className + "@";
    }
    result = result + "{ ";
    for (int i = 0; i < jjtGetNumChildren(); ++i) {
      ASTKeyValue kv = (ASTKeyValue) children[i];

      if (i > 0) {
        result = result + ", ";
      }
      result = result + kv.getKey() + " : " + kv.getValue();
    }
    return result + " }";
  }
}
